This circuit was obtained in a 1964 Electronic Design. The transistors are from the era and the instrument is 100 uA full-scale.
Found in a 1960 General Electric documentation, this crowbar circuit blows the fuse in case of...
This circuit was originally designed for testing crystals used in color televisions, but it works...
This bridge-biased transistor test circuit measures gain in the range 0 to 300. Circuit is from...